This is the Dan Campbell era. 

Runs true to size. For oversized fit, order size up.

I am 5'10 170 lbs and wear XL for oversized and L for normal fit.

Not affiliated with nor licensed by any organizations. 

.: 80% combed ringspun cotton, 20% polyester
.: Medium-heavy fabric (8.2 oz /yd² (280 g/m²))
.: Tear away label